InlineHtmlFrame derived colorScheme from useIsDark(), which reads the
.dark class through React state that only updates a render after
applyTheme() has already mutated the DOM (use-theme-epoch.ts's own
comment documents this ordering: "a child's effect runs before the
provider's applyTheme"). collectThemeBridge() reads the CSS token
values live via getComputedStyle() on every render, so a render caught
between the DOM mutation and the epoch-triggered re-render built a
frame with fresh dark tokens but a stale light color-scheme -- a
transparent iframe with color-scheme:light still paints its canvas
white, so the widget showed near-white text on a white canvas (#123048).
Move the color-scheme read into collectThemeBridge() itself, off
document.documentElement.dataset.hermesMode (the same attribute
applyTheme() sets the token values from, and the pattern
lib/selection-copy-colors.ts's renderedMode() already uses for the
same reason), so the scheme and the tokens it decorates always come
from one synchronous read.
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